Abstract:The comparative study results of pollen morphology of the mutational witches' brooms and the normal part of the tree crown in Scots pine are presented. There is a decrease of pollen grains size, especially the sacci, in witches' brooms. The witches' brooms with more intensive branching have more expressive changes. Also, the witches' brooms have more abnormal pollen grains. The data on the occurrence about 10 anomalous morphotypes of pollen grains are reported, most of that are related to the abnormal developm… Show more
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